<html><head><base href="placeholder"></head><body><div class='definition'><pre><span style="color:#000080;font-weight:bold;">class</span> <span style="color:#000000;">Main</span></pre></div><div class='content'>
  <pre><code><span style="">map.compute(key,&#32;(k,&#32;v)&#32;-&gt;&#32;(v&#32;==&#32;</span><span style="color:#000080;font-weight:bold;">null</span><span style="">)&#32;?&#32;msg&#32;:&#32;v.concat(msg))</span></code></pre>  </pre>
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